So if I understand correctly, they want to scan all your photos, stored on your private phone, that you paid for, and they want to check if any of the hashes are the same as hashes of child porn? So... all your hashes will be uploaded to the cloud? How do you prevent them from scanning other stuff (memes, leaked documents, trump-fights-cnn-gif,... to profile the users)? Or will a huge hash database of child porn hash…
This is the big one right here. A malware will definitely be created, almost immediately, that will download files that are intentionally made to match CP - either for the purposes of extortion or just watching the world burn. I'm usually sticking my neck out in defence of more government access to private media than most on HN because of the need to stop CP, but this plan is so naive, and so incredibly irresponsible…
Even if you do a content aware hash where you break the file into chunks and hash each chunk, you still wouldn’t be able to magically recreate the hash of a CP file without also producing part of the CP.